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/***
*fstat.c - return file status info** Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.**Purpose:* defines fstat() - return file status info**Revision History:* 03-??-84 RLB Module created* 05-??-84 DCW Added register variables* 05-19-86 SKS Ported to OS/2* 05-21-87 SKS Cleaned up declarations and include files* 11-01-87 JCR Multi-thread support* 12-11-87 JCR Added "_LOAD_DS" to declaration* 05-25-88 PHG Merged DLL and normal version* 10-03-88 GJF Adapted for new DOSCALLS.H, DOSTYPES.H.* 10-04-88 JCR 386: Removed 'far' keyword* 10-10-88 GJF Made API names match DOSCALLS.H* 11-07-88 GJF Cleanup, now specific to 386* 04-13-89 JCR New syscall interface* 05-23-89 PHG Added mask to ignore network bit when testing handle* type* 05-25-89 JCR 386 OS/2 calls use '_syscall' calling convention* 03-12-90 GJF Replaced _LOAD_DS with _CALLTYPE1, added #include* <cruntime.h>, removed #include <register.h> and fixed* the copyright. Also, cleaned up the formatting a bit.* 04-04-90 GJF Removed #include <dos.h>.* 07-24-90 SBM Removed '32' from API names* 08-13-90 SBM Compiles cleanly with -W3* 09-28-90 GJF New-style function declarator.* 12-04-90 SRW Changed to include <oscalls.h> instead of <doscalls.h>* 12-06-90 SRW Added _CRUISER_ and _WIN32 conditionals.* 01-21-91 GJF ANSI naming.* 04-26-91 SRW Implemented fstat for _WIN32_ and removed level 3* warnings.* 02-13-92 GJF Replaced _nfile by _nhandle for Win32.* 05-27-92 SKS File Creation and File Last Access timestamps may be 0* on some file systems (e.g. FAT) in which case the* File Last Write time should be used instead.* 06-04-92 SKS Changed comment that used to say "This is a BUG!"* to explain that this value cannot be computed on* OS/2 or NT. Only MS-DOS provides this functionality.* The drive number is not valid for UNC names.* 06-25-92 GJF Use GetFileInformationByHandle API, also cleaned up* formatting of Win32 verson [_WIN32_].* 08-18-92 SKS Add a call to FileTimeToLocalFileTime* as a temporary fix until _dtoxtime takes UTC* 08-20-92 GJF Merged two changes above.* 12-16-92 GJF Win32 GetFileInformationByHandle API doesn't like* device or pipe handles. Use _S_IFIFO for pipes.* 04-06-93 SKS Replace _CRTAPI* with __cdecl* 04-06-93 GJF Made computation of file times consistent with _stat().* 07-21-93 GJF Converted from using __gmtotime_t to __loctotime_t.* This undoes part of the change made on 04-06-92* 12-28-94 GJF Added _fstati64.* 02-15-95 GJF Appended Mac version of source file (somewhat cleaned* up), with appropriate #ifdef-s.* 06-11-95 GJF Replaced _osfhnd[] with _osfhnd() (macro referencing* field in ioinfo struct).* 06-27-95 GJF Added check that the file handle is open.* 09-25-95 GJF __loctotime_t now takes a DST flag, pass -1 in this* slot to indicate DST is undetermined. * 07-08-96 GJF Replaced defined(_WIN32) with !defined(_MAC), and* defined(_M_M68K) || defined(_M_MPPC) with * defined(_MAC). Removed obsolete REG* macros. Also,* detab-ed and cleaned up the format a bit.* 12-19-97 GJF Exception-safe locking.* 05-17-99 PML Remove all Macintosh support.* 10-27-99 GB Remove #inlcude <dostypes.h>********************************************************************************/
#include <cruntime.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <msdos.h>
#include <io.h>
#include <internal.h>
#include <stddef.h>
#include <oscalls.h>
#include <stdio.h>
#include <mtdll.h>
#include <time.h>
#define IO_DEVNBR 0x3f
/***
*int _fstat(fildes, buf) - fills supplied buffer with status info**Purpose:* Fills the supplied buffer with status information on the* file represented by the specified file designator.* WARNING: the dev/rdev fields are zero for files. This is* incompatible with DOS 3 version of this routine.** Note: We cannot directly use the file time stamps returned in the* BY_HANDLE_FILE_INFORMATION structure. The values are supposedly in* system time and system time is ambiguously defined (it is UTC for* Windows NT, local time for Win32S and probably local time for* Win32C). Therefore, these values must be converted to local time* before than can be used.**Entry:* int fildes - file descriptor* struct stat *buf - buffer to store result in**Exit:* fills in buffer pointed to by buf* returns 0 if successful* returns -1 and sets errno if unsuccessful**Exceptions:********************************************************************************/
#ifdef _USE_INT64
int __cdecl _fstati64 ( int fildes, struct _stati64 *buf )
#else /* ndef _USE_INT64 */
int __cdecl _fstat ( int fildes, struct _stat *buf )
#endif /* _USE_INT64 */
{ int isdev; /* 0 for a file, 1 for a device */ int retval = 0; /* assume good return */ BY_HANDLE_FILE_INFORMATION bhfi; FILETIME LocalFTime; SYSTEMTIME SystemTime;
if ( ((unsigned)fildes >= (unsigned)_nhandle) || !(_osfile(fildes) & FOPEN) ) { errno = EBADF; return(-1); }
#ifdef _MT
/* Lock the file */ _lock_fh(fildes); __try { if ( !(_osfile(fildes) & FOPEN) ) { errno = EBADF; retval = -1; goto done; }#endif /* _MT */
/* Find out what kind of handle underlies filedes
*/ isdev = GetFileType((HANDLE)_osfhnd(fildes)) & ~FILE_TYPE_REMOTE;
if ( isdev != FILE_TYPE_DISK ) {
/* not a disk file. probably a device or pipe
*/ if ( (isdev == FILE_TYPE_CHAR) || (isdev == FILE_TYPE_PIPE) ) { /* treat pipes and devices similarly. no further info is
* available from any API, so set the fields as reasonably * as possible and return. */ if ( isdev == FILE_TYPE_CHAR ) buf->st_mode = _S_IFCHR; else buf->st_mode = _S_IFIFO;
buf->st_rdev = buf->st_dev = (_dev_t)fildes; buf->st_nlink = 1; buf->st_uid = buf->st_gid = buf->st_ino = 0; buf->st_atime = buf->st_mtime = buf->st_ctime = 0; if ( isdev == FILE_TYPE_CHAR ) {#ifdef _USE_INT64
buf->st_size = 0i64;#else /* ndef _USE_INT64 */
buf->st_size = 0;#endif /* _USE_INT64 */
} else { unsigned long ulAvail; int rc; rc = PeekNamedPipe((HANDLE)_osfhnd(fildes), NULL, 0, NULL, &ulAvail, NULL);
if (rc) { buf->st_size = (_off_t)ulAvail; } else { buf->st_size = (_off_t)0; } }
goto done; } else if ( isdev == FILE_TYPE_UNKNOWN ) { errno = EBADF; retval = -1; goto done; /* join common return code */ } else { /* according to the documentation, this cannot happen, but
* play it safe anyway. */ _dosmaperr(GetLastError()); retval = -1; goto done; } }
/* set the common fields
*/ buf->st_ino = buf->st_uid = buf->st_gid = buf->st_mode = 0; buf->st_nlink = 1;
/* use the file handle to get all the info about the file
*/ if ( !GetFileInformationByHandle((HANDLE)_osfhnd(fildes), &bhfi) ) { _dosmaperr(GetLastError()); retval = -1; goto done; }
if ( bhfi.dwFileAttributes & FILE_ATTRIBUTE_READONLY ) buf->st_mode |= (_S_IREAD + (_S_IREAD >> 3) + (_S_IREAD >> 6)); else buf->st_mode |= ((_S_IREAD|_S_IWRITE) + ((_S_IREAD|_S_IWRITE) >> 3) + ((_S_IREAD|_S_IWRITE) >> 6));
/* set file date fields
*/ if ( !FileTimeToLocalFileTime( &(bhfi.ftLastWriteTime), &LocalFTime ) || !FileTimeToSystemTime( &LocalFTime, &SystemTime ) ) { retval = -1; goto done; }
buf->st_mtime = __loctotime_t(SystemTime.wYear, SystemTime.wMonth, SystemTime.wDay, SystemTime.wHour, SystemTime.wMinute, SystemTime.wSecond, -1);
if ( bhfi.ftLastAccessTime.dwLowDateTime || bhfi.ftLastAccessTime.dwHighDateTime ) {
if ( !FileTimeToLocalFileTime( &(bhfi.ftLastAccessTime), &LocalFTime ) || !FileTimeToSystemTime( &LocalFTime, &SystemTime ) ) { retval = -1; goto done; }
buf->st_atime = __loctotime_t(SystemTime.wYear, SystemTime.wMonth, SystemTime.wDay, SystemTime.wHour, SystemTime.wMinute, SystemTime.wSecond, -1); } else buf->st_atime = buf->st_mtime;
if ( bhfi.ftCreationTime.dwLowDateTime || bhfi.ftCreationTime.dwHighDateTime ) {
if ( !FileTimeToLocalFileTime( &(bhfi.ftCreationTime), &LocalFTime ) || !FileTimeToSystemTime( &LocalFTime, &SystemTime ) ) { retval = -1; goto done; }
buf->st_ctime = __loctotime_t(SystemTime.wYear, SystemTime.wMonth, SystemTime.wDay, SystemTime.wHour, SystemTime.wMinute, SystemTime.wSecond, -1); } else buf->st_ctime = buf->st_mtime;
#ifdef _USE_INT64
buf->st_size = ((__int64)(bhfi.nFileSizeHigh)) * (0x100000000i64) + (__int64)(bhfi.nFileSizeLow);#else /* ndef _USE_INT64 */
buf->st_size = bhfi.nFileSizeLow;#endif /* _USE_INT64 */
buf->st_mode |= _S_IFREG;
/* On DOS, this field contains the drive number, but
* the drive number is not available on this platform. * Also, for UNC network names, there is no drive number. */ buf->st_rdev = buf->st_dev = 0;
/* Common return code */
done:#ifdef _MT
; } __finally { _unlock_fh(fildes); }#endif /* _MT */
return(retval);}
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